Transfers of information in a communications network

ABSTRACT

The invention features various techniques for managing transfers of information in public packet switched communications networks. In one aspect, the invention provides a system for identifying updated items of network-based information, such as pages, to users in a network. A master server receives the data from each of a plurality of network servers and merges them into one or more master logs. The logs have entries that pertaining to creation of or changing of pages of information. Another aspect of the invention features a system for implementing security protocols. A proxy server translates links from a protocol incompatible with the network tool to a protocol compatible with the network tool and back-translates the link. Another aspect of the invention features a system for managing authenticating credentials of a user. A proxy server manages a user&#39;s authenticating credentials automatically on behalf of the user. Another aspect of the invention features a system for inducing advertisers to target advertisements to consumers. An advertising broker receives advertisements and messages indicating that users. Have read the advertisements, and causes an offer having monetary value to be executed. Another aspect of the invention features a system for extracting data from sources of network-based information in a communications network. An object embedding-program locates a script program and causes the script program to extract data from a page of information.

PRIORITY CLAIM

The present application is a continuation of, claims priority to and thebenefit of U.S. patent application Ser. No. 09/645,933, filed Aug. 25,2000, now U.S. Pat. No. 7,191,447 which is a divisional of U.S. patentapplication Ser. No. 08/548,137, filed on Oct. 25, 1995, now abandonedthe entire contents of which are incorporated herein.

BACKGROUND

This invention relates to managing transfers of information incommunications networks such as the World Wide Web.

One aspect of the invention relates to managing queries for new orchanged items of network-based information. Many services providestanding queries over streams of information such as news wires, e-mail,bulletin boards, and stock quotations. These services are sometimescalled “information filters,” “continuous queries,” or “clippingservices. ”News Edge and Compuserve are two examples of such services.

Another aspect of the invention relates to using proxy servers toimplement security protocols on behalf of network tools and to managesets of authentication credentials for users. Existing corporatenetworks often include a gatekeeper or proxy or fire-wall server thatprovides a single point of entry and exit from the corporate network tothe rest of the world. The network browsers on the corporate networkcreate network requests, and the proxy server forwards them to serverson the Internet. The proxy intercepts all traffic to and from eachbrowser, and ensures that only a very restricted set of traffic andpeople can access the corporate network from the outside.

Another aspect of the invention relates to inducing advertisers totarget advertisements to consumers for whom the advertisements arelikely to be of interest. On the Internet it is presently possible foradvertisers to do direct advertising to individual consumers bybroadcasting “junk mail” that appears in user e-mail and networkbulletin boards.

Another aspect of the invention relates to extracting data from sourcesof network-based information on a communications network. Objectembedding tools are known such as OLE (Object Linking and Embedding) andOpenDoc that are used to build compound documents. These tools contain alink to an object that the tool embeds within a compound document suchas a word-processor document or a spreadsheet. If the object changes,the compound document changes accordingly.

SUMMARY

In one aspect, the invention features a system for identifying updateditems of network-based information to users in a public packet switchedcommunications network that includes a plurality of network servers. Thesystem includes a master log server and a plurality of user computers.The master log server periodically receives data from at least some ofthe plurality of network servers. The master log server causes the datato be assembled into a one or more master logs having a plurality ofentries. Each of the master logs includes at least one entry. Each entrypertains to creation of or changing of an item of network-basedinformation, such as a page of information,, that has occurred within apredetermined time span. The master log server causes at least some ofthe entries in the one or more master logs to be transmitted to one ofthe user computers. The user computer receives a user query comprising arequest to provide to a user at least a subset of the entries in the oneor more master logs, wherein each of the entries in the subset matches asearch pattern contained in the user query. The search pattern includesan identification of a time period. The user computer causes the userquery to be executed by providing to the user, from each of the one ormore master logs into which data has been assembled within the timeperiod, the subset of the entries.

In one embodiment, the data received by the master log server from thenetwork servers comprises logs having entries pertaining to creation ofor changing of items of network-based information. In anotherembodiment, the master log server is programmed to compute log entriesfor network servers that do not forward logs to the master log server,by directly querying the servers and comparing the current contents ofthe servers to the master log or logs, which indicate when the contentsof each server was last noticed to change.

By providing a master server that receives data from each of a pluralityof network servers and assembles the data into one or more master logs,and user computers provide entries in response to queries limited toparticular time periods, the invention provides a set of efficient logsthat enable user queries limited to particular time periods to beexecuted on the World Wide Web, which has thousands of the networkservers each with its own unique content, without requiring the usercomputer to communicate with each of the network servers.

Another aspect of the invention features a system for implementingsecurity protocols in a public packet switched communications networkcomprising a plurality of network servers that receive requests fromusers for items of network-based information and that transmit the itemsof network-based information to the users in response to the requests. Anetwork tool, implemented on a computer, receives a first item ofnetwork-based information that includes a link in a protocol compatiblewith the network tool. In response to user input selecting the link, thenetwork tool creates a request for the second item of network-basedinformation. The request includes the link. A proxy server, implementedon a computer, receives the first item of network-based information fromone of the network servers, wherein the link is in a protocolincompatible with the network tool, translates the link into theprotocol compatible with the network tool, and transmits to the networktool the first item of network-based information, with the link beingtranslated into the protocol compatible with the network tool. The proxyserver receives the request for the second item of network-basedinformation from the network tool, retrieves the link from the request,back -translates the link into the protocol incompatible with thenetwork tool, and requests the second item of network-based informationfrom one of the network servers.

By providing a proxy server that translates links from a protocolincompatible with the network tool to a protocol compatible with thenetwork tool and that back-translates the link, the invention enablesWeb browsers and tools that don't implement Web security protocols suchas SSL and SHTTP to access information that would otherwise beunavailable to these browsers and tools.

Another aspect of the invention features a system for managingauthenticating credentials of a user of a public packet switchedcommunications network that includes a plurality of network servers thatreceive requests from users for items of network-based information andtransmit the items of network-based information to the users in responseto the requests. A network tool, implemented on a computer, creates arequest for an item of network-based information from one of the networkservers in response to input from a user, and receives the item ofnetwork-based information in response to the request. A proxy server,implemented on a computer, maintains a table of authenticatingcredentials for each of the plurality of network servers, receives therequest from the network tool, and forwards the request to the networkserver. The proxy server receives a request for authentication from theone of the network servers, retrieves from the table authenticatingcredentials for the network server, transmits the authenticatingcredentials to the network server, receives the item of network-basedinformation from the network server, and forwards the item ofnetwork-based information to the network tool.

By providing a proxy server that manages a user's authenticatingcredentials automatically on behalf of a user, the invention enables theuser to avoid having to assume the responsibility of managing andremembering a large number of differing authenticating credentials, orhaving to use the same authenticating credentials for a large number ofservices. Using the same authenticating credentials for a large numberof services can increase the risk that a breach, in security inconnection with one service will affect other services. Moreover, a usermay be able to use a particular set of authenticating credentials inconnection with one service but not another service, for example if oneof the credentials is already being used by another user of the otherservice. The invention avoids the annoyance to the user of having totype in a user ID and password each time the user visits a subscriptionservice.

Another aspect of the invention features a system for inducingadvertisers to target advertisements to consumers in a public packetswitched communications network that includes a plurality of networkadvertiser servers that transmit advertisements. The system includes anadvertising broker server and a plurality of user computers. Theadvertising broker server receives advertisements from each of thenetwork advertiser servers. Each of the advertisements is targetedtoward at least one of a plurality of users served by the advertisingbroker server and is accompanied by an offer having monetary value foracceptance of the advertisement. The advertising broker server transmitsat least one of the advertisements to one of the user computers operatedby a user targeted by the advertisement. Each one of the plurality ofuser computers receives advertisements from the advertising brokerserver and, whenever a user of the user computer has read anadvertisement, sends a message to the advertising broker serverindicating that the user has read the advertisement. The advertisingbroker server receives the message indicating that the user has read theadvertisement, and, in response thereto, causes the offer havingmonetary value to be executed.

By providing an advertising broker programmed to receive advertisementsand messages indicating that users have read the advertisements, and tocause an offer having monetary value to be executed, the inventioninduces advertisers to target advertisements to consumers and inducesthe consumers to read the advertisements. Thus, the invention provides asubstitute for direct broadcasting of “junk mail” to users for whom theadvertisements are not of interest and who must separate such directadvertising from important personal and work messages.

Another aspect of the invention features a system for extracting datafrom sources of network-based information in a communications networkthat includes a plurality of network servers programmed to transmitnetwork-based information over the network. A script program,implemented on a computer in the communications network, extracts datafrom network-based information provided by one of the network servers.An object embedding program, implemented on a computer in thecommunications network, includes a link to the network-based informationprovided by the network server and a link from which the objectembedding program can locate the script program. The object embeddingprogram applies the script program to the network-based information soas to cause the data to be extracted from the network-based information,and embeds the data within a compound document implemented on a computerin the communications network.

By providing an object embedding program that can locate a scriptprogram and cause the script program to extract data from an item ofnetwork-based information, the invention enables users to extract datafrom Web pages or other items of network-based information and embed itin documents, including spreadsheets and other applications, withoutincluding extraneous content-from the Web pages, yet while enabling theextracted information to change whenever the Web pages change.

BRIEF DESCRIPTION OF THE DRAWINGS

The various objects, advantages and novel features of the presentdisclosure will be more readily apprehended from the following DetailedDescription when read in conjunction with the enclosed drawings, inwhich:

FIG. 1 is a diagram of a system for providing updated pages, or otheritems of network-based information, to users in accordance with theinvention.

FIG. 2 is a diagram of another system for providing updated pages ofinformation to users in accordance with the invention, in which themaster server duplicates its master logs onto multiple slave servers.

FIG. 3 is a diagram of a system for implementing security protocols onbehalf of a network tool that does not implement them, in accordancewith the present invention.

FIG. 4 is a diagram of the system of FIG. 3 illustrating how a proxyserver manages authenticating credentials on behalf of a user inaccordance with the invention.

FIG. 5 is a diagram of a system for inducing advertisers to target theiradvertisements to consumers for whom the advertisements are likely to beof interest, in accordance with the invention.

FIG. 6 is a diagram of a system for extracting information from pages ofinformation on a communications network, in accordance with theinvention.

DETAILED DESCRIPTION

With reference to FIG. 1, in the World Wide Web network 10, each ofthousands of Web servers 12 prepares daily compressed logs of pages ofinformation (or other informational objects such as programs, multimediacontent, or files) that are new or have changed within the last day. Thelogs contain entries of the form: <URL, time, content tags, title>. The“URL” is a universal resource locator that identifies a particular pageor other item of information that is new or has changed. The “time” isthe date and time when the page has most recently been modified. The“content tags” are a set of short classifications of the page'scontents. These tags, which identify such things as suitability forchildren, the type of content, etc., are utilized during the process ofsearching for relevant pages.

The “title” is the title of the page.

For example, a particular log entry might be of the form:

<http:/*/www.openmarket.com/home.html, 10/16/95 11:32a, (Rating/G,Category/Business/Internet/ Software, Class/Home-page}, (Open MarketHome Page1>.

Every day, each of Web servers 12 sends its daily logs to a master logserver 14. The master log server merges the daily-logs from the Webservers into a master set of logs. These logs are the day log, the weeklog, the month log, and the year log. The day log contains all of thepresent day's daily logs as they arrive from Web servers, merged into asingle log. Every midnight, the day log is merged into the week log, andthe day log is cleared. Once a week, the week log is merged into themonth log and the week log is cleared. Once a month, the month log ismerged into the year log and cleared.

When entries from one log are rolled over into another log, e.g. fromthe day log into the month log, if both logs contain an entry for thesame URL, the most recent entry should be retained and the older onediscarded.

Master log server 14 indexes each of the master logs by each of thefields in the log entries (URL, time, content tags, and title). Thisenables fast searches.

Users at user computers 16 can use queries to search the master logs tofind pages that are changed or new. A typical query might be as follows:Find all pages that are new or changed within the last week that are inCategory /Business/Internet/Software. Each such page that is of interestto the user could reside on any of the thousands of Web servers 12 onnetwork 10.

In one embodiment, user computers 16 transmits the queries directly tomaster log server 14 and master log server 14 transmits to theappropriate user computer 16 the entries that match the search patterncontained in the query transmitted by that user computer. In anotherembodiment, master log server 14 downloads its logs into each of usercomputers 16, and the queries are executed internally by user computers16.

Thus, system 10 enables World Wide Web users to discover new or changedpages that might be of interest to them. For example, a consumer canfind out whenever new pages appear concerning video cameras. Anoffice-products salesman can find out whenever new businesses in aparticular sales district publish new pages or change their old pages. Alobbyist for a certain company can monitor the pages of all local,state, and federal politicians and agencies for any references to theparticular company or issues affecting the particular company.

The user queries are typically “standing queries,” which are queriesthat are re-evaluated periodically (once a day, once a week, etc.).Daily queries are associated with the day log, weekly queries areassociated with the week log, etc.

Immediately before master log server 14 rolls the day log over into theweek log, the standing daily queries are matched against the day log andthe results are sent back to the users. Similarly, immediately beforethe master log server rolls the week log over into the month log, thestanding weekly queries are matched against the week log. Standingqueries can also be evaluated at other times as desired by users.

In an alternative embodiment, master log server 14 maintains a largerset of logs: log-1, log-2, log-4, . . . log-2n. Log-1 contains entriesfor the present day. Every day, log-1 is rolled over into log-2. Everytwo days, log-2 is rolled over into log-4. In general, log-2i is rolledover into log-2i+1 every 21 days.

This structure of logs improves upon the daily/weekly/monthly/yearlystructure because it avoids the weekly and monthly “hiccup” that occurswhen the logs are rolled over. For example, once a month, the monthlylog is rolled over into the yearly log and the monthly log is cleared.Thus, in the first day of the month, a user who asks “what's changedthis month” may see only what has changed in the last day.

With the log-21 format, a user can ask what has changed in the last 30days, for example. The system then matches the query against log-1,log-2, log -4, log-8, and log-16, which will yield pages that havechanged in the last 32 days, which is the lowest power of 2 greater than30.

In yet another embodiment, master log server 14 maintains a singlemaster log of all data received from Web servers 12.

In certain embodiments, the logs are “compressed” by omitting detailbefore they are transmitted between Web servers 12 and master log server14, or between the master log server and user computers 16.

For example, master log server 14 may send out to user computers 16compressed logs that just list which Web servers 12 contain pages thathave changed, along with the time of the most recently modified page onthat server, for example:

<http://www.openmarket.com/*, 10/16/95 11:32a><http://www.netscape.com/*, 10/16/95 12:45p> <http://www.src.dec.com/*,10/16/95 10:43a>.

Users could use such a compressed log to determine which Web servers 12have some content that has changed recently, even though the particularpages that have changed are not identified in the entries received byuser computers 16.

The search pattern contained in the query from the user would include atime period specification and perhaps a partial URL, but would notinclude complete URLs, content tags, or titles.

In certain embodiments, Web servers 12 do not forward logs to master logserver 14. The master log server computes log entries for Web servers 12by directly querying the Web servers and comparing the current contentsof the Web servers to the master log or logs, which indicate when thecontents of each Web server was last noticed to change.

More generally, in certain embodiments Web servers 12 or master logserver 14 compress logs to any level in the URL hierarchy, based on eachparticular Web server's content. For example, the daily log for the openMarket Web server might be compressed as follows:

http://www.openmarket.com/what's-new/*, 10/16/95 11:32ahttp://www.openmarket.com/infor/*, 10/14/95  4:54p<http://www.openmarket.com/library/*, 10/18/95  4:31a>.

With reference to FIG. 2, in another embodiment, master server 14duplicates its master logs onto multiple slave servers 30. The slaveservers execute user queries or redistribute the master logs to usercomputers 16 in the manner described above with respect to master server14.

Once a day, master server 14 sends its day log to each of slave servers30. Each slave server maintains its own copy of the day log, week log,month log, and year log, and does its own rolling over from day intoweek, week into month, and month into year. Each slave server alsomaintains its own indexes of the entry fields (URL, time, content tags,title). Slave servers 30 off-load much of the work from master server 14and allow a greater flow of queries from user computers 16 to beexecuted, while reducing communications costs.

FIG. 3 shows a system for implementing security protocols on behalf of anetwork tool that does not implement them. In World-Wide Web network 32,a proxy server 34 is inserted between a user's Web browser 36 andnetwork servers 38 on the Internet. Each user has a personal proxyserver 34, which may be located on the same computer as the user's Webbrowser 36. Proxy server 34 intercepts all requests for pages (or otheritems of network-based information) made by browser 36 and all responsescoming back from network servers 38. Proxy server 34 can execute theappropriate security protocols on behalf 5 of Web browser 36.

Many Web browsers and tools don't implement the new Web securityprotocols SSL, SHTTP, and PCT (a new standard protocol similar to SSL).These protocols are more complicated than the original and very simpleWeb protocols.

To implement the security protocols SSL, SHTTP, and PCT on behalf of abrowser 36 that doesn't understand them, proxy server 34 examines eachincoming page of information 35 requested by browser 36. Proxy server 34translates all secure URLs on the page to special unsecure URLs and thenforwards the translated page 37 to browser 36.

An SSL URL has the form: https://x/y/z. Proxy server 34 translates asecure URL of the form https://x/y/z to an unsecure URL of the form http://PROXY/x/y/z/SSL.

An SHTTP URL has the form: shttp://x/y/z. In addition, a Web pagecontaining SHTTP URLs must include additional information tellingbrowsers how to access those URLs. That additional information appearsin two places: in anchors and in tagged fields elsewhere on the page.

Anchors are special fields on an HTML page that contain URLsrepresenting links to other pages (HTML is the language in which Webpages are written). An SHTTP anchor has the form:

<A href=shttp://x/y/z” S1=s1 S2=s2 . . . Sn=sn F1=f1 F2=f2 . . . Fn=fn>Click here to see this page. </A>.

The Si=si fields are name-value pairs describing SHTTP parameters to beused for accessing this particular URL, and the name-value pairs Fi=fidescribe other aspects of the anchor unrelated to SHTTP.

The rest of the SHTTP information appears elsewhere on the page, inspecially tagged fields of the form:

<Ti>. . . </Ti>

where Ti is a tag specific to the SHTTP protocol.

When presented with a page containing a secure SHTTP URL, proxy server34 rewrites the page, by removing the specially tagged SHTTP fields ofthe form <Ti>. . . </Ti> and by translating the SHTTP anchors into:

<A href=http://PROXY/x/y/z/SHTTP#####” S1=si S2=s2 . . . Sn=sn F1=f1F2=f2 Fn=fn> Click here to see this page. </A>.

The trailing component #####, which represents an encoding of the Si=siname-value pairs from the original anchor and the tagged fields <Ti>. .. </Ti>, is a string of letters and digits that encode data needed toreverse the translation and execute the security protocol to retrievethe URL. Any encoding scheme can be used that obeys the standard URLsyntax.

When the user clicks on one of the translated unsecure URLs, the requestto read its page is intercepted by proxy server 34. The prefix “PROXY/”identifies the JRL to the proxy server as a translation. The proxyserver back-translates it to the original secure URL and executes theSHTTP secure protocol to request the page from network server 38.

In an alternative embodiment, instead of directly encoding the SHTTPparameters in the URL, proxy server 34 maintains a table with entriesfor each translated URL, each entry containing the Si=sn name-valuepairs and the <Ti>. . . </Ti> fields. The ##### in the translation isreplaced by the number of the corresponding table entry, rather than thecontents of the entry.

With reference to FIG. 4, proxy server 34 can manage a user'sauthenticating credentials automatically on behalf of the user. When auser registers to use a subscription service on the Web, the user isassigned a set of credentials identifying the user to the service. Thecredentials may be a simple user ID and password or a public key andprivate key pair.

To manage the user's credentials automatically, the proxy server storesa table 40 of pairs <S, C>, where S represents the name of asubscription service's server and C represents the correspondingcredentials for that service. The table is stored on/the user's computerand is protected by a single password or smart card. When the user firststarts a Web session, proxy server 34 will ask the user to supply thatsecret.

When browser 36 requests a page (or other item of network-basedinformation) from network server 38, proxy server 34 forwards therequest to network server 38. Network server 38 may respond with a“please authenticate” message. At this point, browser 36 wouldordinarily display a dialog box asking the user to type in a user ID andpassword. But, in the present invention, proxy server 34 looks in table40 for credentials corresponding to network server 38 and sends themback to the network server. The network server replies with therequested page, which proxy server 34 forwards to browser 36.

In this way, proxy server 34 automatically executes the authenticationon behalf of the user, without any notice or typing on the part of theuser. This is important because a user often can't or doesn't want touse the same credentials for each of the service to which the usersubscribes. As the number of such services grows, it is difficult forthe users to manage all of their credentials.

FIG. 5 Is a diagram of a system 42 for inducing advertisers to targettheir advertisements to consumers for whom the advertisements are likelyto be of interest. An advertising broker server 44 provides eachconsumer with a “personal billboard” 46, which is a Web page only thatparticular consumer can read. Network advertiser servers 48 bid forspace on each consumer's billboard 46 with offers of cash and couponsfor discounts on goods and services. Network advertiser servers 48 placeads on billboard 46 customized for the particular consumer, and theadvertisements are ordered on the billboard by the amount of the bid.When a consumer reads the ad, the consumer receives the cash or coupon.Advertising broker server 44 receives a payment for each advertisementplace on billboard 46 and each advertisement read by a consumer.

The consumer's actual name and mailing address may be provided toadvertising broker server 44 when the consumer registers with theadvertising broker server. Advertising broker server 44 and networkadvertising servers 48 can build profiles of individual consumers usingtraditional mailing lists, a survey filled out by the consumer when theconsumer registers, or a record of the advertisements and Web pages theconsumer actually reads.

In order to record which advertisements and Web pages the consumerreads, advertising broker server 44 provides a program that runs on theconsumer's computer. The program is either the consumer's Web browser 50itself, or a “proxy server” 52 that sits between Web browser 50 and theInternet. The program records all advertisements and pages the consumerreads, in a manner that ensures that a real person, rather than acomputer program, has read each advertisement. Otherwise, clever userscould write a program that reads every advertisement and collects theoffered cash. The program may require the user to provide userauthentication to advertising broker server 44.

There are a number of techniques for ensuring that a real person hasread a particular advertisement, associated with differing degrees ofsecurity. For example, proxy server 52 could detect whether there wereany mouse clicks or key clicks in a windows program immediatelypreceding, within a fraction of a second, a request from browser 50 toread a particular page. Alternatively, the pages of information might beset up in a manner such that the user must read several pages beforereceiving any money, and proxy server 52 could require that a user spenda certain amount of time (e.g., 30 seconds) reading each page.Alternatively, the pages may include forms and the user must fill outthe form before receiving any money.

Many consumers would be concerned that detailed logs of what they readwould be given to advertisers. There are two ways to solve this problem.In one embodiment, advertising broker server 44 digests the detailedreading logs provided to the advertising broker server by each usercomputer into abstract consumer profiles, which the advertising brokerserver then transmits to network advertiser servers 48, perhaps for afee. In another embodiment, advertising broker server 44 assigns aunique number to each consumer, and the advertising broker server 44gives the reading logs to network advertiser servers 48 keyed by thenumber rather than the consumer's name. Only advertising broker server44 knows the correspondence between number and name. In either approach,the advertising brokerage service contractually promises never todisclose the consumer's identity without the consumer's permission.

Direct advertising on the Web removes the middleman of broadcastadvertising. Traditionally, advertisers “pay” consumers to view theiradvertisements by subsidizing the cost of consumer entertainment such astelevision, radio, newspapers, and magazines. But, direct advertising onthe Web spends that money directly on the consumer.

With direct advertising sent via U.S. mail, a successful response cancost a substantial amount of money. Direct advertising on the Web can bemuch, much cheaper, and so it can be expected that advertisers will bewilling to spend some of that money in direct payments to consumers whoread their advertisements.

The payments encourage the advertisers to closely target theiradvertisements to those consumers most likely to read them, and theysignal to consumers the worth of the information contained in theadvertisement. An advertiser that carefully targets its audience may bewilling to offer a large amount of money to a consumer to read itsadvertisement. Such a large amount signals to the consumer that thisadvertisement is special in some way and most likely contains valuableinformation.

Consumers can be expected to like the personal billboard because it isunobtrusive in that consumers can read advertisements only when theywish to do so, because the consumer is likely to see advertisements thatare of interest to the consumer, and because the consumer is paid forreading the advertisements.

Advertisers can be expected to like the personal billboards because theyare relatively inexpensive, because they can efficiently target thoseconsumers most likely to want their products, and because theadvertisers can induce consumers to read the advertisements with cashand coupons.

One implementation of the system of FIG. 5 is exemplified as follows.Using customer profiles supplied by advertising broker server 44, anetwork advertiser server 48 submits to advertising broker server 44 anadvertisement specifically targeted for a particular customeridentification number. The advertisement is accompanied by an offer of acertain amount of money to be paid to the broker for placing theadvertisement on billboard 46, a certain amount of money to be paid tothe broker if the consumer reads the advertisement, and a certain amountof money to be paid to the consumer if the consumer reads theadvertisement.

Advertising broker server 44 maps the consumer identification number toa particular consumer and places the advertisement on the consumer'spersonal billboard. The billboard is a Web page that is readable only bythe consumer (standard Web security enforces this). The advertisementson the page are ordered according to the value of their bids.

Proxy server 52, which sits between the user's browser 50 and thenetwork, filters all network traffic to and from the browser.

When the user reads an advertisement by clicking on its URL in browser50, proxy server 52 verifies that a real user, rather than a computerprogram, is reading the advertisement, and, using encryption technology,sends proof to advertising broker server 44 that the user read theadvertisement.

Advertising broker server 44 transmits a request to payment computer orswitch 54 to pay the user the appropriate amount of money and to pay thebroker the appropriate amount of money. The payment computerauthenticates the payment request, and causes payment to be executedupon authentication of the payment request. This can be accomplished inthe manner set forth in U.S. patent application Ser. No. 08/168,519,filed Dec. 16, 1993, and U.S. patent application Ser. No. 08/328,133,filed Oct. 24, 1994, the entire disclosures of which are herebyincorporated herein by reference.

Proxy server 52 records all advertisements and pages read by the userand periodically sends a log of these advertisements and pages toadvertising broker server 44.

The advertising broker server 44 digests all of the usage logs of theusers and sends consumer profiles, tagged by anonymous consumeridentifiers, to network advertiser servers 48.

FIG. 6 is a diagram of a system for extracting information from pages ofinformation (or other items of network-based information) on acommunications network. The system provides an OLE object 56 forextracting data from a page 58 or any other source of network-basedinformation and embedding it in a document 60. OLE is Microsoft'sstandard method of building compound documents. OLE object 56 containsthe URL of page 58 containing the desired data. OLE object 56 alsocontains a link from which the OLE object can locate a script program62, written in a scripting language such as TCL that, when evaluated,extracts the desired data from data page 58.

OLE object 56 can be embedded within any compound document 60 such as aword-processor document or a spreadsheet. The result of applying scriptprogram 62 to data page 58 is inserted into compound document 60. Scriptprogram 62 may strip away useless content, or it may transform thecontent from one representation into another more suitable for theapplication. For example, the script program may convert an HTML tableinto a Microsoft Word table.

In general, each different kind of data page 58 will have a differentscript program 62. For example, there can 5 be one script for PAWWSstock quotes, another for National Weather Service weather reports,another for mortgage rates published in the Mercury News, etc. Scriptprograms can be associated with data pages 58 in a number of differentways.

For example, a user or vender can write a particular script program 62for a particular page 58 or class of pages and bind that script program62 into OLE object 56.

Alternatively, the URL of a page containing script program 62 can beencoded in data page 58 in special HTML (Hypertext Markup Language)comments, which a browser normally doesn't show to the user. OLE object56 looks for the special comments, retrieves the contents of the pagereferenced by the URL in the comments, and uses the contents as ascript. This approach is appropriate when the provider of data page 58also supplies script program 62.

Alternatively, data page 58 is tagged with a content tag describing thetype of the page, for example, PAWWS/Stock/Quote. Using a table 64 onthe side, OLE object 56 maps the content tag to a script program 62.This is appropriate when the script program is supplied by a third partythat doesn't have access to the contents of data page 58.

Script program 62 is digitally signed by a trusted third party,certifying that the script is safe to execute and is not a virus ormalicious program. Such certification is a known technique.

The invention is also applicable to other compound documentarchitectures other than OLE, such as, for example, OpenDoc.

It can be seen that the extracted information can exclude the extraneouscontent of most information on the Web that makes pages of informationpleasing to read within Web browsers. In other words, these pages ofinformation are not in a “raw” form suitable for use with otherapplications such as spreadsheets.

As an example of a situation in which the object embedding is useful,the PAWWS Financial Network provides up-to-date stock quotes over theWeb. A financial analyst can include some quotes in a spreadsheet thatgets updated every day, without having to manually cut and paste quotesfrom the Web page into the spreadsheet. The analyst can automaticallyextract the closing price for a given company from a page of informationcorresponding to that company, and can insert the closing price into thespreadsheet in such a way that when the contents of the page arechanged, the corresponding contents of the spreadsheet are changed.

Script program 62 can be configured to automatically notice when page 58changes, by, for example, polling the page on a regular basis. When page58 changes, script program 62 recomputes the result it provided as partof compound document 60, and calls the compound document manager to havethe compound document updated and optionally displayed.

As another example, a real-estate agency can give its customers aprinted flyer listing current mortgage rates for several of the localbanks, extracted from a larger listing published on the Web by the citynewspaper. The real-estate agency can update the flyer every weekwithout cutting and pasting from the newspaper Web page.

There have been described systems and methods for managing transfers ofinformation in communications networks. It will be apparent to thoseskilled in the art that numerous modifications of and departures fromthe specific embodiments described herein are possible without departingfrom the inventive concepts set forth in the claims.

1. A system for extracting data from sources of network-basedinformation in a packet-switched communications network comprising aplurality of network servers programmed to transmit network-basedinformation over said network, comprising: a computer, coupled to saidcommunication network; a script program, implemented on a computer insaid communications network, structured to extract a portion of datafrom network-based information received from one of said networkservers; and an object embedding program, implemented on one of thecomputer and a second computer in said communications network,comprising a link to said network-based information and a link fromwhich said object embedding program can locate said script program,wherein the object embedding program executes said script program tocause said portion of data to be extracted from said network-basedinformation, and to embed said portion of data within a compounddocument, wherein said link from which said object embedding program canlocate said script program is said link to said network-basedinformation, and wherein said network-based information in turncomprises a link to said script program.
 2. A system in accordance withclaim 1, wherein said link from which said object embedding program canlocate said script program comprises a direct link to said scriptprogram.
 3. A system in accordance with claim 1, wherein said linkcomprises a universal resource locator.
 4. A system in accordance withclaim 1, wherein said computer on which said object embedding program isimplemented comprises said computer on which said compound document isimplemented.
 5. A system in accordance with claim 1, wherein saidnetwork-based information is a page of information.
 6. A method ofextracting data from network-based information in a packet-switchedcommunications network comprising the steps of: executing an objectembedding program to locate a script program from a link in said objectembedding program; applying said script program to network-basedinformation, provided by a network server, to which said objectembedding program is linked by a link in said object embedding program,and applying said script program to said network-based information;executing said script program to extract a portion of data from saidnetwork-based information provided the network server; and continuing toexecute said object embedding program to embed said portion of datawithin a compound document, wherein said link from which said objectembedding program can locate said script program is said link to saidnetwork-based information, and wherein said network-based information inturn comprises a link to said script program.
 7. The method of claim 6,wherein said link from which said object embedding program can locatesaid script program comprises a direct link to said script program. 8.The method of claim 6, wherein said link comprises a universal resourcelocator.
 9. The method of claim 6, wherein said network-basedinformation is a page of information.
 10. A system for extracting datafrom sources of network-based information in a packet-switchedcommunications network comprising a plurality of network serversprogrammed to transmit network-based information over said network,comprising: a computer, coupled to said communication network; a scriptprogram, implemented on a computer in said communications network,structured to extract a portion of data from network-based informationreceived from one of said network servers; and an object embeddingprogram, implemented on one of the computer and a second computer insaid communications network, comprising a link to said network-basedinformation and a link from which said object embedding program canlocate said script program, wherein the object embedding programexecutes said script program to cause said portion of data to beextracted from said network-based information, and to embed said portionof data within a compound document, wherein said link from which saidobject embedding program can locate said script program comprises saidlink to said network-based information, and wherein said network-basedinformation comprises an identification of a table comprising a link tosaid script program.
 11. The system of claim 10, wherein said link fromwhich said object embedding program can locate said script programcomprises a direct link to said script program.
 12. The system of claim10, wherein said link comprises a universal resource locator.
 13. Thesystem of claim 10, wherein said network-based information is a page ofinformation.
 14. A method of extracting data from network-basedinformation in a packet-switched communications network comprising thesteps of: executing an object embedding program to locate a scriptprogram from a link in said object embedding program; applying saidscript program to network-based information, provided by a networkserver, to which said object embedding program is linked by a link insaid object embedding program, and applying said script program to saidnetwork-based information; executing said script program to extract aportion of data from said network-based information provided the networkserver; and continuing to execute said object embedding program to embedsaid portion of data within a compound document, wherein said link fromwhich said object embedding program can locate said script programcomprises said link to said network-based information, and wherein saidnetwork-based information comprises an identification of a tablecomprising a link to said script program.
 15. The method of claim 14,wherein said link from which said object embedding program can locatesaid script program comprises a direct link to said script program. 16.The method of claim 14, wherein said link comprises a universal resourcelocator.
 17. The method of claim 14, wherein said network-basedinformation is a page of information.